/Engine/Source/Editor/LevelEditor/Public/LevelEditor.h
Iterate all registered viewport types
void IterateViewportTypes ( [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< void([FName](API\Runtime\Core\UObject\FName), const [FViewportTypeDefinition](API\Editor\LevelEditor\FViewportTypeDefinition) &)> Iter )